After-hours buzz: CalAmp, Google, Paychex & more

Check out which companies are making headlines after the bell Tuesday:

CalAmp - The wireless technology provider reported first-quarter adjusted earnings per share of 19 cents on $59 million in revenue. Analysts had expected earnings of 18 cents on $58 million in sales. But shares dropped in after-hours trading after the company projected second-quarter revenue beneath expectations.

General Motors - The auto manufacturer confirmed a chemical explosion Tuesday left one worker with life-threatening injuries at a metal stamping factory in Marion, Ind., according to the Associated Press. Shares of GM edged lower in after-hours trading.

Google - The Internet search company said it had purchased Songza, a music-streaming service, but did not disclose terms. Its shares were slightly higher in after-hours trading.

Pandora Media - Shares of the Internet-music provider fell in after-hours trading on news of the deal for Songza.

Paychex - The payroll processor tallied fourth-quarter earnings per share of 40 cents on $639 million in revenue. Analysts estimated a profit of 40 cents on $617 million in sales. Shares rose in after-hours trading.